Feeding mechanism for metal-working machinery



A. M. sosA.

FEEDING MECHANISM FOR METAL WORKING MACHINERY.

APRLICATION'FILED sEPT.1o, |917.

Patented Apr. 19-, 1921,

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FEEDING MECHANISNI FOR METAL WORKING MACHINERY.

- APPLICATION FILED sPT.10, 1911.

1,375,024. Patented 19, 1921.

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AUGUSTUS M. sosa, or CiNCINNATL'YOHIC, AssreNon To THE AMERICAN Toor. WORKS COMEANY, or CrNCrNNATI, oHio, A CORPORATION `or OHIO.

FEEDING MEGHANISM FOR METAL-WORKING MACHINERY.

T 0 all whom it may concern.'

i Be it known that 1, AUGUSTUS M. SOSA, a citizen of the United States, residing atl Cincinnati, in the county of Hamilton and State of 0h10, have' inventedcertain new and useful Improvements in Feeding Mechanism for Metal-Working Machinery, of which the following is a specification. l

I have exemplified my invention as embodied in a drilling machine comprising a laterally extending supporting arm having a tool-slide guidable laterally thereon and'an axially movable tool-spindle for supporting the cutting tool. l

My invention relates to feeding mechanism for metal working machinery, especially to the means for counterweighting the tool-spindle.

It is the object of my invention to provide a novel arrangement of counterweighting mechanism located at the same side of the t0ol-arm atfwhich the tool-slide has its guiding connection ,with the tool-arm and embodying a exible' connection between the counterweight and the tool-spindle, where-- by the weight 0f the tool-Spindle and coun terweight are located at the same side of the tool-arm, for relieving those guiding faces between the tool-slidey and tool-arinwhich receive vthe end-thrust of thetool, from the Stress of the weight of the spindle and counterweight. n

It is a further object of my invention to provide novel means for arresting descent of the counterweight uponr accidental disconnection of the counterweight from the tool-spindle.

The invention will be further readilyunderstood from the following description and claims, and from` thedrawings, in which latter:v A

Figure 1 is a front elevation of the toolslide and a portion of the drill-arm of a drilling machine, vembodying' my invention, the front portion of the casing of the toolslide being partly broken away.

Fig. 2 iS a side elevation of the same, with part of the casing broken away, and partly- Fig. 6 is an enlargeddetail section of thecounter-weight and its rod, taken in the plane of the line 6 6 of Fig. y4; and,

Fig. 7 is a detail cross-section of the counter-weight and its rod, taken in the plane of the line 7 7 of Fig. 6.

The tool-slide of the drilling machine, which is exemplified as embodying my invention, is represented at 11. It is instanced as Supported by a supporting arm 12,.exempliiied as a drill-arm, on which it is laterally adjustable. rlhe drill-arm is provided with a guide 13 extending lengthwise thereof.

The lower part of this guide comprises a. rearwardly and upwardly extending inclined face 14 which, with the forward face 15 of the guide, coacts with an inclined face 16 and a rear face 17 in the tool-slide. The upper portion of the guide comprises an upper face 13 extending at substantial right angles to the forward guiding face 19, and a rearguiding face 20, respectively coacting Specication of Letters Patent. Pajggntgd Apr. 19 1921 i .allpiicationrfuea' september 1o, 191'?. Serial No. 190,655.

with the horizontal face 21, the rear facev fr slide at suitable intervals lengthwise of theV guide' on the tool-slide. The inclined guidefaces 14 and 16 receive the upward thrust of the tool, exemplilied as a drill 26, in the tool-spindle 27, exemplified as a drill-spin! dle. It is desirable to relieve these inclined faces of other duty and to prevent wedging, action on said faces. y

The' lateral adjustment of the tool-slide may be accomplished by providing the sup-` porting arm with a rack 31, with which a pinion 32 is arrangedcto mesh in usual'` manner, the pinion being operated in suit# able manner, as by a hand-wheel 33 on a shaft 34, journaled in bearings 35 on the tool-slide, and having a worm 36 fast thereon. The worm meshes with a worm-wheel 37 fast on a shaft 38, the shaft having a gear 39 fast thereon which meshes with the pinion 32.

The drill-spindle 2,7 is mounted on the tool-slide in usual manner, and usual meansy are provided for rotatively driving and forl feeding the Same. Thus a Shaft 41 extends lengthwise of the supporting arm, being driven in suitable manner at selective speeds from the column of the drilling machine by usual means, not shown because wellknown. The shaft has a sleeve 42 thereabout, said sleeve 4movable with the drillhead and having spline-connection 43 with the shaft. A'pair of opposed `bevel-geene 44, 45, are normally loose about-the sleeve,-

` a bushing 54 journaled in a bearing 55 of together.

the tool-slide. The gear 53 has spline-connection 56 with the drill-spindle for permitting -,axial movement of the drill-spindle in the gear and retaining` driving connection between the gear and drill-spindle throughout said axial movements.

The drill-spindle rotates in a sleeve 61, between which and the spindle there are end-abutment bearings 62, 63, for causing axial movement of the spindle with the sleeve; r1`he sleeve slides axially in a bearing 64 on the tool-slide. It is provided with a Vkey 65 guided lengthwise in a slot 66 in said bearing. The sleeve is provided with a rack 69 with which a pinion 70 engages, the pinion being fast on va shaft 71 which is received in av bushing 72 vof a face-plate7 3, a keyy 74 securing said shaft and bushing A worm-wheel 76 is provided with abushing 77 in which the bushing 72 is arranged to rotate, the bushing 77 being Vrotatable in a bearing 78 in the tool-slide.

The pinion is arranged to be rotated,

veither by means of said worm-wheel, or by means ofV handles 79 extending from said face-plate. A clamp 80 is arranged to clamp the face-plate to the worm-wheel, the faceplate having an annular bearing 81 about said worm-wheel. f

rllhe worm-wheel is arranged to be operated by a worm 86 which meshes therewith and is fast on a shaft 87 journaled in a bearing- 88 of the tool-slide and having a handwheel 89 for manually operating the same. The worm 86 may also be rotated by a shaft 91, the lower end of which is received journ'alwise in a bore 92 in said worm. lT he shaft 91 is journaled in a bearing 94. A clutch 95'is arranged to operatively connect the shaft 91 with the worm, the teeth of the clutch being respectively on the hub of said worm and on a Ycollar 96, having spline-connection 97 with the shaft 91. The collar is arranged to be moved lengthwise of the shaft, for connecting or releasing said clutch, by means of a fork 98, vthe tines of which are received in an annular groove 99 in. said collar, the fork being actuated by a handle 100. v l

The shaft 91 is arranged to be rotated,V preferably at selective speeds, as by means of coacting nests of gears of various diameters, exemplified at 101, the speeds'of which are controlled by an index-wheel 102, in any well-known manner, and which are operated by means of al gear 108 fast with the gear 53 about the drill-spindle, the gear 103 meshing with a gear 104 arranged to drive the gears of the nests of gears.

Feeding or axiall movements may be imparted to the toolspindle manually by means of the handles 79, for causing quick raising and lowering of the .tool-spindle, or the lfeeding movements may be imparted to the tool-spindlemanually by means of the hand-wheel 89, or by means of the powerdriven gearing through the medium of the clutch 95. I The counterweighting mechanism for the Vtool-spindle is exemplified as comprising a weight 106, slidable on a guide-rod 107. The guide-rod is connected at its lower end with the tool-slide, as by a screw 108. rEhe guiderod is, at its upper end, .received through a thimble 109 in an aperture 110 in a cross-web 111 of the casing 112 of the tool-slide, a nut 113 about the threaded end of the guide-rod clamping the guide-rod in place in stretched relation. The guide-rod is parallel with the drill-spindle andadjacent thereto, for locating the counterweight and the drill-spindle at the same side of the drill-arm. Suitable parts ofthe casing are made removable for insertion ,of the working parts.

The counterweight is connected with the drill-spindle by al flexible connection 115, which extends upwardly from its connection with the counterweight over a suitable 'pulley 116 on a shaft 117 journaled in bearingsV 118 Vof the cross-web 111, and extending thence downwardly and having connection at 119 with a bracket 120 fixed to the axially movable sleeve 61 about the drill-spindle.

By this arrangement of the counterweight`` ing means for the drill-spindle, the downward stress upon the tool-slide, ldueto the: weight of the drill-spindle and `the counterbalance weight, is' exerted along adjacent parallel lines forwardl of the guide on the supporting arm for the tool-slide. As a result, the weight of the tool-.slide is4 so balanced upon said supporting armas to avoid any tendency of the slide to tilt rearwardly uplon the supporting arm, which is the case w en the counterweight is positioned in rear of the supporting arm, which latter arrangement has a tendency to cause the tool-slide to tilt onv the supporting arm, employingthe corner between the faces 18 and 19 as a fulcrum, anddrawing the lower inclined face 16 of the tool-slide outwardly into wedging engagement with thecoacting inclined face 14 of the guide, so as to cause a binding stress between the tool-slide and its supporting arm,.which prevents ready lateral adjustment of the tool-slide.

The detrimental eects of such :an arrangement are avoided Vin my device, in which the weight of the drill-spindle and counterweight are exerted upon the toolslide in parallel lines forwardly of the guide therefor on the supporting arm, being connected by the flexible connection, whereby the stress of the weight-of the tool-slide and the parts supported thereby are received in downward direction between the guide-faces 18, 21, the tool-slide further being supported by the frontand rear upper guiding faces of the guide and guideway between the supporting arm and tool-slide, to avoid tilting of the 'tool-slide, and tending to relievefpressure between the inclined faces 14 and 16 forA providing ease of lateral adjustmentA and preventing tilting and wear of the parts', and thereby insuring accuracy in the position of the drill, the upward thrust of which is received by the faces 14 and 16.

The counterweight is provided with a safety latch arranged to prevent dropping thereof upon accidental disconnection of the counterweight from the drill-spindle, as may be caused, for example, by breakage of the flexible connection between them. Y

For this purpose a bore 121 extends through the counterweight, forming a slideway through which the guide-rod 107 extends. The counterweight is provided with a recess 122 at the side of the slideway. latch 123 is received in this recess and is pivoted to the counterweight on a pin 124. The latch is provided with a tooth 125 which is arranged to selectively engage the teeth of a rack 126 on the guide-rod upon failure of the normal supporting means for the counterweight. rlhe latch is provided with an arm 127 at the side of the pivot-pin 124 opposite the latching v-tooth thereon.

' The flexible connection from the drill-spindle is connected to the operating arm of the latch, preferably by having a ring 128 thereon received over ahook 129 pivoted tothe operating arm of the latch by a pin 130. The normal upward pull. exerted by the fiexible connection upon the operating arm is such as to normally cause disengagement of the tooth of the latch from the teeth on the guide-rod.

Upon failure of the flexible connection to support the counterweight, the tooth of the latch is arranged to be forced into engagement with that portion of the rack adjacent to the latch at the time` of such failure.

This isl exemplified aseifected by a yieldable plunger 131 acting on the heel 132 of the latch, preferably at that side of the pivot ofthe latch opposite the tooth thereon, so that the toothofthe latch'is forced intoengagement with an adjacent tooth on the guide-rod. The plungeris received in a bore 134 in the counterweight, and is yieldingly urged toward the latch by a spring 135 received about the shank 136 of the plunger between'a shoulder 137 on said plunger and a plug 138V threaded into the outer end of said bore. (See Fig.` 6.)

vThe operating arm of the latch is provided with a contact-face 139 arranged to abut acontact-face 140 on the wall of the recess 122 in the counterweight, when the tooth of the latch has been'moved intomeshing engagement with the rack, for preventing swinging movement of the latch beyond its operative latching position and avoiding a'shearing force on its pivot. When the latch 123 has thus engaged the rack, it will prevent descent of the counterweight, thus avoiding the dropping of the counterweight and consequent jarring of the tool-'slide or parts thereof, or of the machine, and avoidinginjury to the operator by reason of falling of the counterweight. The tool-slide comprises a casing 112 which surrounds the spindle and incloses the driving means and feeding means for the spindleomo'unted on the tool-slide, as well as the counterweight mechanism on the tool-slide, forming a compact structure wherein the parts mentioned are contained, and forming a self-containedstructure.

The counterweight comprises a skeleton 146 in which the recess and bore for receiving the latch and plunger therefor are contained, and havingvtherein the bore through which the supporting rack extends. This skeleton supports the operating parts of the arresting means for the counterweight Y mechanism. It is, for instance, a castin of usual gray iron, and is provided with o -set faces 147, 148, and 149, and with a projection 150 having a ribk 151 thereon. A body 152 of heavier metal, for instance, lead, is cast about said projection for securing the same to said skeleton, said weighting body depending from said skeleton. The Y weighting body has a portion of the bore 121 therethrough. My improved construc- Y tionprovides readymeans whereby a heav counterweight for the spindle is provide which occupies small space and enhances the compactness of the tool-slide and the structures mounted thereon.

My improved device further provides means whereby the counterweight is inclosed in a strong closed casing, so that, even if there were failure of the latch to stop the accidental dropping of the counterweight, the counterweight could not drop off the tool-head, but would be retained in the casing. f

Having thus fully described my invention,

what I claimas new and desire to secure by Letters Patent, is: Y

l l. In a metal working machine, the conibination of a tool-slide, an axially feedable tool-spindle .journaled thereon, a counterweight movable in a line substantially parallel with the line of feeding movement of 2. In a drilling machine, the combination with the axially feedable drill-spindle, of counterweighting means therefor comprising a counterweight movable in a line sub-` stantially parallel with the line of feeding movement of said drill spindle, a coacting rack therefor, a latch pivoted to said counterweight and provided with a tooth for engagement with the teeth of said rack, a resilientpart acting on said latch to urge said tooth into engagement with-said rack, the pivot of said latchl being located between said resilient part and said rack, and

a tension-member supporting said `weight having connection with said latch atv the same side of its pivot as the side with which said resilient partV coacts and extending directly upwardY from said latch to` exert a pull on said latch ina line substantially parallel with the line of movement of said counterweight. Y if 3. Ina drilling machine, the combination with the axially feedable drill-spindle: of a .counterweight therefor, said .counterweight having a bore therethrough, a rack received through said bore, said axially; f

feedable drill-spindle, said bore and' said rack being substantially parallel, a springpressed plunger; a latch. having a pivot on said counterweight, said latch provided belowcits pivot with a; tooth for'engagement.

with said rack, a heel arranged to bepressed by said spring-pressed plunger to urge 'engagement of said latch with said rack, and a 'i heel arranged to engage said counterweight to prevent overthrowr of said latchr lwith, re-

lation to said rack, and a tension-membery having connection with saidlatch and eX- tending directly .from said` latch in a* direction substantially parallel with said rack to exert direct pull on said latchv in line with Ythe line of movementof said counterweight.

In testimony where`0f, I have hereunto signed my name in the presence of two subscribing witnesses.

Witnesses: Y

ALBERT L. JENNINGS, ALLENVA. EDWARDS.

AUGUsTUs M. sosa, 

